Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, dan yang
yang yang » wang yang, wang yan
a patents » _ patents, a patent, 4 patents
patents a » patents ca, patients a, patents _
dong cao » dong xiao, dan cao, dong nan
eu long » au long
long du » long d, long do, long run
ya a » a a, y a, ye a
a eu » _ eu, a e, i eu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong cao) OR (((dong yang) OR (yang yang)))) ya a patents a eu long du ;~.
• Adding a wildcard symbol may retrieve word variants: ((dong cao) or (((dong yang) or (yang yang)))) ya a patents a eu long du ;*.